What Quantum-Safe Cryptography Means for Your Crypto

Quantum computers are no longer science fiction. IBM, Google, and a number of national governments are pouring billions into quantum research — and the cryptography that secures your Bitcoin wallet, your Ethereum transactions, and virtually every financial system on the planet is built on math that a sufficiently powerful quantum computer can break.

Why today's crypto is vulnerable

Most cryptocurrency wallets rely on Elliptic Curve Digital Signature Algorithm (ECDSA) — the same algorithm used to sign Bitcoin and Ethereum transactions. ECDSA's security depends on the computational difficulty of solving the elliptic curve discrete logarithm problem. Classical computers would take millions of years. A quantum computer running Shor's algorithm could do it in hours.

That means if a quantum computer gets your public key (which is visible on-chain every time you transact), it could derive your private key and drain your wallet.

The NIST response

The National Institute of Standards and Technology (NIST) spent eight years evaluating post-quantum cryptographic algorithms. In August 2024, they published FIPS 204 — the Module-Lattice-Based Digital Signature Standard, also known as ML-DSA (previously CRYSTALS-Dilithium). This is now the official US government standard for quantum-resistant digital signatures.

ML-DSA is based on the hardness of problems over module lattices — mathematical structures that are believed to be resistant to both classical and quantum attacks.

How SchnelPay protects you today

SchnelPay uses a hybrid signature scheme called QuantumShield™ that combines ML-DSA-65 (NIST FIPS 204) with ECDSA. Every transaction and authentication event is signed with both algorithms simultaneously. This means:

• If ECDSA is broken by quantum computers, ML-DSA remains intact.
• If there is ever a flaw discovered in ML-DSA, ECDSA provides a fallback.
• You get the security benefits of both worlds with no extra effort on your part.

This hybrid approach is specifically recommended by NIST during the transition period as organisations migrate from classical to post-quantum cryptography.

When does quantum risk become real?

Most experts estimate that cryptographically relevant quantum computers — ones powerful enough to break ECDSA — are 10 to 15 years away. But there is a well-known attack called "harvest now, decrypt later": adversaries record encrypted communications today and decrypt them once quantum computers exist.

For financial systems, this is not a future problem. Organisations that handle sensitive transaction data need to be quantum-safe now, before harvest-and-decrypt attacks become viable.

What this means for users

If you use SchnelPay, you do not need to do anything. Quantum-safe protection is built into the platform at the infrastructure level. Your custodial account is already protected by ML-DSA-65 + ECDSA hybrid signatures.

For non-custodial users, the security of your private keys depends on your wallet provider. We recommend monitoring announcements from major wallet providers (Ledger, MetaMask, etc.) about their post-quantum roadmaps.

Questions about SchnelPay's security architecture? Email us at [email protected].